mod_proxy handling of error returns from scheme handlers

[Rici Lake]

Just a query: I was looking at the code for mod_proxy.c and I wonder if 
the behaviour is really correct.

At line 632, it loops through the configured proxy hosts, trying 
proxy_run_scheme_handler on each one. If it receives any return code 
other than DECLINED or HTTP_BAD_GATEWAY, it accepts the result.

But then at line 656, having failed to find a proxy which will handle 
the request, it tries the request directly. In this case, it retries on 
any error return if max_attempts has not been reached. This would cause 
a retry, for example, on an authentication required status return, 
which seems odd.

Perhaps I am missing something.
Rici